1. Laser-assisted graphene layer exfoliation from graphite slab.
- Author
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Javvaji, Brahmanandam, Vasireddi, Ramakrishna, Zhuang, Xiaoying, Mahapatra, Debiprosad Roy, and Rabczuk, Timon
- Subjects
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GRAPHENE , *GRAPHENE synthesis , *LASER ranging , *GRAPHITE oxide , *THERMAL shock , *LASER pulses - Abstract
Synthesis of graphene with reduced use of chemical reagents is essential for manufacturing scale-up and to control its structure and properties. In this paper, we report the mechanism for exfoliating graphene from graphite slabs using laser impulse. We set up a molecular dynamics model that accounts for the charge-mediated inter-atomic potential along with the forces from electromagnetic fields of a laser pulse. The role of different laser fluences on the exfoliation process of graphene quantified in terms of the interlayer energy transition, inter-layer displacement jump, and thermal shock propagation in graphene-graphite system. The simulation results confirm the exfoliation of a single layer graphene sheet for the laser power ranging from 100 × 10 − 14 to 2000 × 10 − 14 J/nm2. With an increase of laser fluence from 2000 × 10 − 14 to 4000 × 10 − 14 J/nm2, there is an increase in the graphene yield via the layer-after-layer exfoliation. The bridging bond dynamics between the successive graphene layers govern the exfoliation of the second layer. The results indicate promises for producing chemical-free graphene on a large scale for industrial applications. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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